From a circular sheet of paper of radius 10 cm, a sector of area 40% is removed. If the remaining part is used to make a conical surface, then the ratio of the radius and the height of the cone is
A. 3 : 4
B. 4 : 3
C. 1 : 2
D. 1 : 1
A. 3 : 4
B. 4 : 3
C. 1 : 2
D. 1 : 1
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